How to activate my windows 10 pro

[Microsoft Windows]

I purchased a second hand laptop and the laptop keeps notifying me to activate my windows but when I try to activate it tells me that there's an error and it doesn't allow me so now my windows is not activated and I don't know what to do. I don't know if It's because it's a second hand and I dont have a license for it or what. Can I please be assisted.

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